Consecutive Failed Job Runs

SQL practice question · Hard · Gaps & Islands · Databricks

Find streaks of at least 3 consecutive FAILED runs per job, ordered by started_at (ties by run_id). CANCELLED runs are ignored completely: they neither count nor break a streak; a SUCCESS breaks it. Return job_name, streak_start (started_at of the first failure), streak_end (started_at of the last failure) and failed_runs. A job can have several streaks. Order by job_name, streak_start.

Table: job_runs

Schema of job_runs
ColumnType
run_idINTEGER
job_nameTEXT
started_atTIMESTAMP
resultTEXT
Sample rows of job_runs
run_idjob_namestarted_atresult
1etl_orders2026-05-01 01:00:00SUCCESS
2etl_orders2026-05-01 02:00:00FAILED
3etl_orders2026-05-01 03:00:00FAILED
4etl_orders2026-05-01 04:00:00FAILED
5etl_orders2026-05-01 05:00:00SUCCESS
6etl_orders2026-05-01 06:00:00FAILED
7ml_train2026-05-01 00:30:00FAILED
8ml_train2026-05-01 01:30:00FAILED
Expected output on the sample data
job_namestreak_startstreak_endfailed_runs
etl_orders2026-05-01 02:00:002026-05-01 04:00:003
ml_train2026-05-01 03:30:002026-05-01 06:30:004

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